Question 1

Which of the following best explains why Listeria monocytogenes is frequently associated with meningitis outbreaks linked to refrigerated foods?

Accepted Answer

L. monocytogenes can grow at low temperatures, such as those found in refrigerators.

Question 2

A 3-year-old child presents with fever, stiff neck, and headache. Which body fluid should be sampled to diagnose bacterial meningitis?

Accepted Answer

Cerebrospinal fluid (CSF)

Question 3

Which of the following statements about the blood–brain barrier is correct?

Accepted Answer

It prevents many substances, including most antibiotics, from entering the brain.

Question 4

A patient is diagnosed with tetanus after stepping on a rusty nail. Which of the following best describes the target of the tetanus vaccine?

Accepted Answer

The exotoxin produced by Clostridium tetani

Question 5

Why is sausage now rarely a cause of botulism, despite its historical association with the disease?

Accepted Answer

The addition of nitrites inhibits the growth of Clostridium botulinum.

Question 6

Which of the following is the most common source of airborne cryptococcal infections?

Accepted Answer

Dried pigeon or chicken droppings

Question 7

A patient presents with progressive flaccid paralysis and blurred vision. Laboratory tests confirm the presence of a neurotoxin. Which of the following is the most likely diagnosis?

Accepted Answer

Botulism

Question 8

Which of the following diseases is transmitted by mosquitoes?

Accepted Answer

Arboviral encephalitis

Question 9

A laboratory is testing reusable surgical instruments for prion contamination. Which of the following is the recommended sterilization method?

Accepted Answer

Soak in concentrated sodium hydroxide ($$NaOH) $$and autoclave at $$134^\circ C$$ for 1 hour.

Question 10

Which of the following best explains why postexposure vaccination for rabies is a practical option?

Accepted Answer

The rabies virus has a long incubation period, allowing time for the immune response to develop after exposure.

Question 11

Which of the following is a key reason why vaccine development for African trypanosomiasis is challenging?

Accepted Answer

The protozoan changes its surface antigens frequently.

Question 12

A patient with a history of immunosuppression develops a lung infection that spreads to the brain. Latex agglutination tests for antigens in CSF are positive. Which organism is most likely responsible?

Accepted Answer

Cryptococcus neoformans

Question 13

Which of the following statements about prions is correct?

Accepted Answer

Prions are self-replicating proteins with no detectable nucleic acid.

Question 14

A 6-month-old infant is diagnosed with botulism. Which of the following is the most likely source of infection?

Accepted Answer

Ingestion of C. botulinum spores that germinate in the infant's intestines

Question 15

Which of the following is the primary vector for African trypanosomiasis?

Accepted Answer

Tsetse fly

Question 16

A patient presents with loss of sensation in the skin surrounded by nodules. Acid-fast rods are observed in a skin biopsy. Which disease is most likely?

Accepted Answer

Tuberculoid leprosy

Question 17

Which of the following is a major preventive measure during local outbreaks of arboviral encephalitis?

Accepted Answer

Mosquito control programs to reduce vector populations

Question 18

Which of the following statements about the Salk and Sabin polio vaccines is correct?

Accepted Answer

The Salk vaccine contains inactivated poliovirus and is administered by injection.

Question 19

A patient develops spasms of the jaw muscles and difficulty breathing after a puncture wound. Which neurotoxin is responsible for these symptoms?

Accepted Answer

Tetanospasmin

Question 20

Which of the following best describes the pathogenesis of rabies after a bite from a rabid animal?

Accepted Answer

The virus multiplies in skeletal muscle, then travels along peripheral nerves to the CNS.

Microbial Diseases of the Nervous System: Study Guide

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